Add test for subtype.

test/test_subtype.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+# coding: utf-8
+
+from nose import main
+from nose.tools import *
+from msgpack import packb, unpackb
+from collections import namedtuple
+
+class MyList(list):
+    pass
+
+class MyDict(dict):
+    pass
+
+class MyTuple(tuple):
+    pass
+
+MyNamedTuple = namedtuple('MyNamedTuple', 'x y')
+
+def test_types():
+    assert_equal(packb(dict()), packb(MyDict()))
+    assert_equal(packb(list()), packb(MyList()))
+    assert_equal(packb(MyNamedTuple(1,2)), packb((1,2)))
+
+
+if __name__ == '__main__':
+    main()